AR 15 - semi-automatic only M16 - depending on variant capable of full auto or burst fire. Will also fire semi-auto.
M4 is the carbine- shorter barrel
AR15, M16, M4, Ruger Mini 14
The M4 is capable of automatic fire, the AR 15 is not
The M4 CARBINE IS BETTER THAN THE M16.
AR-15 = Semi-Auto civilian rifle M4 = Select Fire Military rifle
The M4 is the carbine version of the M16 (carbine means short barreled rifle). Search Wikipedia for M16 for more reading.
Not really too much to tell. The M16 has a longer barrel, and the projectiles will leave the barrel with greater velocity for it. The M4 has the collapsible buttstock and 14.5 inch barrel, so it would be the easier of the two to utilise in urban terrain and such. The M16's longer gas system is the more reliable of the two, and the muzzle flash and noise of the M16 is reduced. The operating mechanism is the exact same, except that the M4 and M16 won't use the same return spring or buffer.
The M16 assault rifle has a greater range than the M4 carbine as a result of its 20-inch barrel, compared with 14.5 for the M4. The M16 can hit an area target out to 800 meters while the M4 is effective to 600 meters.
An M4 is a short barreled version of the M16, so yes, they can look quite similar.
The M16. The M16 entered production in 1960. The M4 entered production in 1984, and was an improvement over the earlier XM-177 carbines.
Yes, along with the carbine version of the M16, the M4.
Not entirely. The Marines retained the M16, and most Army mech units opted for the M16A4 rather than the M4.